Bolt Pattern of 5 Bolt Brake Mounting Flange for Trailer Brakes

Question

Question:

I have an oddball question. On the standard 5 hole brake backing plate mounting flange, what is the center to center spacing between the bolt holes? I understand that the standard 5 bolt flange is an industry standard for trailer axles with 5 bolt patern but I would like to know what that standard is. Thank you,

asked by: Keith H

0

Expert Reply:

The bolt pattern for a 5 bolt brake mounting flange, like # 4-44-1 is 5 on 3-7/8 inches.

What that means is it measures 3-7/8 inches from one corner to its diagonal counterpart. From hole to hole across the bottom is 3 inches and between the others is about 2-1/8 inches.

I've made a diagram that may help.

expert reply by: Charles S

0

click to enlarge

Jon

3/28/2024

Hi I have a older 6 lug 6 lb axles the bolts all measure the same across like you're saying but the center hole is like three and a quarter would that work for the center hole it's a three axle trailer and the guy when I bought it said it was around early 70s thanks for info

Reply

Answer 1

Most 5-bolt brakes use flange #4-44-1. That's not to say that there aren't some oddball or older styles that might have had a different 5-bolt pattern but the vast majority are going to use what could be considered as the standard. I…

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Answer 2

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more…

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Answer 3

If the surface on the inside of the drum where the shoe pads make contact isn't smooth then a brake shop may be able to turn the drums. If that surface or the surface where the magnet makes contact (called the armature surface) is discolored…

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Answer 4

Yes and no. The first thing to note is that the etrailer brake kit you were looking at is part #AKEBRK-6 and is just a regular brake kit while the Dexter Axle kit you were looking at is part #23-464-465 which is their Nev-R-Adjust kit that adjusts…

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Answer 5

Sure thing! For your 2017 Grand Design Momentum 395M, I recommend taking a look at the: - Electric Trailer Brake Kit #AKEBRK-6. This kit includes both the left and the right hand side assemblies, will fit most standard hu and drum assemblies, and…

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Answer 6

The Electric Trailer Brake Kit, #AKEBRK-6 that you mentioned is for manually adjusted brakes for a 12" x 2" Drum on axles rated from 5,200 lbs. to 7,000 lbs. This is the Left Hand (LH) and Right Hand (RH) assembly packaged together and will…

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Answer 7

The brake magnet can indeed be in direct contact with the armature surface of the brake drum, regardless of whether or not the magnet is energized. This doesn't present a problem unless the drum is worn and has grooves in the armature surface.…

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Answer 8

Typically trailer hub and drum assemblies with the 8 lug bolt pattern are going to be 12" in diameter. However this is not always the case, so I recommend measuring your current drums using the included diagram to confirm this. You will also…

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Answer 9

The brake pads themselves being out of adjustment would not cause a fault code to read on your brake controller. You can check the brake pad adjustment by safely raising the trailer and spinning the tire. If you hear a slight lining drag as the tire…

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Answer 10

I'd be happy to help! For replacement brake assemblies you'll need (2) of the #AKEBRK-7-SA for 4 total assemblies (2 axles), but for the correct hubs you'll need to know your bolt pattern The hub options are: 6 on 5-1/2"…

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Answer 11

The trailer will have a plate or sticker on it that will list the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that will list the weight capacity. You can…

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Answer 12

An oil seal like Redline part #9103309 installs in the back side of the hub (the side nearest the trailer's frame) with the sides or "legs" of the seal inserted into the hub's bore. This means that the flat metal surface of the seal…

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Bolt Pattern of 5 Bolt Brake Mounting Flange for Trailer Brakes

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